The paper industry is the largest consumer of Talc and generally uses 300 Mesh (53µ) with the range of brightness varying between 80% to 96%.

Talc is used in three stages of paper making :
As a filler to give smoothness, porosity and opacity to paper in addition to reducing the cost.
To control Pitch and Stikies... during the paper making process, oleoresinous droplets micro or colloidal in nature get added to the stream. These micro impurities can clog the paper machinery. Talc being hydrophobic absorbs these micro droplets or if the droplets are big then talc lamellae stick to their surface thus controling their stickiness.
In coating formulations... because of its platyness and high brightness, talc leads to reduction in usage of expensive whitening and helps in controlling gloss of the coat. Talc also provides smoothnesss to the surface and imparts opacity to the coat.

Additionally talc reduces the friction on paper manufacturing machinery thus reducing wear.